I'm trying to get a particular currency to work using Shopify Buy Button. cart.text.currency works to change the amount to the currency I want, and the checkout etc works fine - amounts are correct. But when I add to cart or indeed go directly to checkout, the prices are in the main currency again.
Is there any directive I can add to the component options to tell Shopify that I want to use the other currency in the checkout? If I visit the store while in Shopify using VPN for that country I am able to checkout in the right currency.